It's kinda hard to say how much gas was when I was in high school, I didn't have to pay for it. My family used to own a large auto parts warehouse and I would go to a customer that had a real service station and sign a ticket for the gas. At the end of the month they sent the tickets to my grand father, who issued a credit to their account with us.

For you youngsters out there, Ethyl was the trademarked name of the lead compound added to gasoline to make higher octane premium gas that was required by those old 10:1 and 11:1 compression ratio engines. Also called an anti-knock compound.

That was back in the day when the only cars with fuel injection were Corvettes and the very rare Chevy sedan. Everything else used those funny things that sat on top of the intake manifolds that any high school kid could adjust....